Dress up however you'd like with items you own. Then click on the All Gaia tab next to the search box for your items (on the Dress Up / Avatar / My Avatar page you are already on where you are dressing your avatar up). That will allow you to try on things you do not own while dressing up your avatar. That way you can try combos and see if they work out before questing and being disappointed.
I don't do RIGs. Ever. But for this, I caved and bought a bundle. Unsurprisingly, I didn't get anything I want, but I didn't exactly strike out either. sweatdrop
Now if all hair RIGs after this can match the quality of these...emotion_dowant